Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS4026581 A
Publication typeGrant
Application numberUS 05/631,665
Publication dateMay 31, 1977
Filing dateNov 13, 1975
Priority dateNov 13, 1975
Publication number05631665, 631665, US 4026581 A, US 4026581A, US-A-4026581, US4026581 A, US4026581A
InventorsMax Pasbrig
Original AssigneeLacrex Brevetti S.A.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Releasable coupling
US 4026581 A
Abstract
A releasable coupling for connecting hoses, pipes, rods or the like. The coupling has a male member and a female member, the female member being provided with an additional guide pipe or sleeve for centering the male member as it is inserted into the female member, to protect a sealing ring of the coupling from damage during the inserting, and also to reinforce the coupled assembly.
Images(1)
Previous page
Next page
Claims(3)
The embodiments of the present invention in which an exclusive property or privilege is claimed are defined as follows:
1. Releasable coupling device comprising cooperating male and female members for sealingly containing fluids therein, a male member with an insert extension having a peripheral surface including a peripheral groove for releasably engaging clamping fingers; a retaining sleeve axially displaceable upon said male member and behind said peripheral groove as viewed from the front edge of said insert extension, said retaining sleeve being slidable against a spring pressure, said retaining sleeve including a sleeve jacket disposed at a predetermined spacing from said peripheral surface of said insert extension, said sleeve jacket covering said peripheral groove when the jacket is in a locked position; and a female member forming a socket bush for receiving the insert extension of the male member, said female member including radially resilient clamping fingers longitudinally extending from the inside surface thereof, said clamping fingers having clamping bosses adapted to engage the peripheral groove of said insert extension, a guide pipe spaced from the inside of said female member clamping fingers by the thickness of wall of said insert extension, said guide pipe extends with its free end at least as far as the bosses of the clamping fingers, said guide pipe outside surface engages and surrounds the inside surface of the insert extension of said male member when the male member is in a connected relationship with the female member to form an elongated tortuous path for sealing purposes, a sealing ring positioned rearwardly from said clamping bosses for sealing the terminal external end portion of said male member insert extension, said sealing ring being positioned at the end of said tortuous path whereby internal fluid seeking to escape must enter the transverse passageway between the male and female members, traverse the longitudinally extending, engaging surfaces defined by the guide pipe and the insert and reverse direction before contacting the sealing ring, and whereby said guide pipe centers said insert extension as it is inserted into said female member, protects said sealing ring from damage during the insertion, and reinforces the coupling device.
2. Clamping device according to claim 1, characterized in that the insert extension of the male member is provided with a shoulder which forms an aligned abuttment joint with the end of the guide pipe when said members are connected with one another.
3. Coupling device according to claim 1 characterized in that the peripheral groove is confined to peripheral segments to provide side limitation for the clamping bosses.
Description

The present invention relates to a releasable coupling device for coupling rods, pipes, hoses or the like, comprising a male member with an insert extension having peripheral surface in which is provided a locking recess of the type of a peripheral groove; a retaining sleeve disposed over said male member and behind said peripheral groove as viewed from the front edge of said insert extension, said retaining sleeve being slidable against a spring pressure, said retaining sleeve including a sleeve jacket disposed at a predetermined spacing from said peripheral surface of said extension, said sleeve jacket being disposed over said peripheral groove when the jacket is in a locked position; and a female member forming a socket bush for receiving the insert extension of the male member, wherein clamping fingers are provided in said female member, said clamping fingers having clamping bosses adapted to engage the peripheral groove of said insert extension.

In a coupling device of this type, the insert extension projects into the female member to form with its inside surface a wall of a passage channel. The front edge of the said insert extension does not always provide for a sealed connection. A required sealing ring can only be applied inside the female member. Thus, the sealing ring often has to be located too close to the unsealed point of contact between the insert extension and the female member. Such a sealing is often sufficient especially for higher pressure, mainly due to the fact that the sealing ring is frequently subjected to a strong and nonuniform load at a noncentered insertion of the insert extension of the male member.

It is therefore an object of the present invention to provide an improved coupling device which would avoid the above mentioned drawbacks and would, at the same time, provide for a centered insertion of the above members into one another, and which would also provide for a sealing capable to withstand a higher pressure.

According to the invention, the above object is achieved by a coupling device of the above mentioned type, wherein a guide pipe is provided which is spaced from the inside of said female member by a distance substantially corresponding to the wall thickness of said insert extension so that the guide pipe is adapted to surround the inside surface of the insert extension of said male member.

Suitably, the guide pipe extends with its free end at least as far as the free ends of the clamping fingers in order to facilitate the introduction of the insert extension.

A distortion free, smooth side wall is obtained, when the guide pipe is arranged to form aligned abutment joint with the inside surface of the insert extension.

The guide pipe makes the coupling device particularly suitable for coupling elements which have to be secured against undesired disengagement.

The drawing shows one embodiment of a clamping or coupling device according to the present invention. In the drawing:

FIG. 1 is a section of both members shown in a disengaged position;

FIG. 2 shows a section of the same members but in an inserted position immediately before the locking;

FIG. 3 is the same section as in FIG. 2, showing the elements in a locked position; and

FIG. 4 is a front view of the female member as shown in FIG. 1.

The coupling device consists of a male member 1 and a female member 2. Both members are provided at their ends opposite to the coupling terminations with a thread 3, 4, for securing the coupling members to rods, pipes, hoses or the like. In the embodiments shown in the drawing, the two members are tubular coupling members for a fluid conduit. The members can also have a cross section different from that shown in the drawings.

The male member 1 forms an insert extension 5 which is adapted to be inserted in a receiving bush 6 of the female member 2. Disposed in the receiving bush is an O-ring 7 for sealing engagement with the insert extension 5. A bevelled surface 9 at the front edge 8 of the extension facilitates the sliding of same through the sealing ring 7. Arranged at a predetermined distance from the front edge 8 is a peripheral groove 10 which is formed in the peripheral surface 11 of the insert extension 5. Extending backwards on the female member as viewed from the receiving end of same is at least one, preferably three clamping fingers 13 the free front ends of which are each provided with an inwardly projecting clamping boss 14, the surface of which is produced to correspond to the shape of the peripheral groove 10 of the insert extension 5. The clamping fingers 13 are somewhat resilient so that they can yield radially outwardly when pressed. The spacing of the clamping bosses 14 from the sealing ring 7 is somewhat smaller than the above noted predetermined spacing, so that the insert extension 5 is surrounded by the sealing ring 7 (FIG. 3) whenever the clamping bosses 14 are in a locked position with respect to the peripheral groove. The peripheral surface 11 of the insert extension is cylindrical or straight and the groove always forms a recess.

A retaining sleeve 18 is provided on the male member 1. The sleeve 18 is arranged at a distance behind the groove 10 as viewed from the front end of the insert extension. A compression spring 19 which rests with its one end against a shoulder 20 of the male member, is arranged to press with its opposite end against a collar 21 of the retaining sleeve and thus maintains the retaining sleeve positioned at its outward or locking position. In this position, the collar 21 rests against a shoulder 22 of the male member, whereby the retaining sleeve is held in its forward position. Preferably, the retaining sleeve is further secured against rotary movement by longitudinal ribs 24 provided at the periphery of the male member, the ribs 24 being received in inner longitudinal grooves 25 of the retaining sleeve. The retaining sleeve is provided with a sleeve jacket 26 which is arranged to surround the peripheral groove 10 of the insert extension when the retaining sleeve is in locked position (FIG. 1 and FIG. 3). The front edge 27 of the sleeve jacket 26 is produced as a stop edge. The sleeve jacket is made from a rigid, non-resilient material. The sleeve jacket surrounds the insert extention 5 at a predetermined spacing. This spacing must be of the size corresponding at least to the thickness of the wall of the clamping fingers 13 so as to allow for passage of the fingers in the space. However, the spacing cannot be too large as it would then allow for release of the clamping bosses from the groove 10, when the sleeve jacket 26 covers the clamping fingers 13 in the locked or coupled position.

If three or more clamping fingers 13 are provided, they form, to a certain degree, guide means. The guiding of the extension 5 can be improved by arranging the clamping fingers 13 inside a guide ring 30, consisting of rigid segment members 31.

The female member comprises an additional inner guide pipe 33 as well as an outer protection jacket 34. The protection jacket 34 partially covers the clamping fingers and also the retaining sleeve 18 when the same is in coupled position. Preferably, the protection jacket 34 is knurled at its outer surface with knurling to provide for a good grip.

The inner guide pipe terminates approximately at the ends of the clamping finger bosses 14. It can also be longer or shorter. However, if it terminates inside of the bosses 14, then the introduction of the insert extension 5 is more difficult. The guide pipe is used in guiding of the insert extension. It prevents the insertion of the extension into the female member at an inclined or twisted position. The guide pipe also secures a uniform loading deformation of the sealing ring 7 during the inserting operation. The joint area 35 (FIG. 3) between the end 36 of the guide pipe and a shoulder 37 provided on the insert extension 5, is sufficiently remote from the sealing ring so that fluid which might eventually enter in this gap has to overcome a comparatively long path between the guide pipe and the insert extention 5 before it reaches the sealing ring 7. The tightness of this coupling device is thus substantially increased. The guide pipe also makes it possible to provide for a tighter joint 35 by exactly aligned and smooth inner walls which do not give rise to an increased resistance to the fluid flow inside. The guide pipe also prevents the breaking of the joint, which results in the possibility of producing the mutually engaged portions, such as the insert extention, clamping fingers etc., in a shorter version, thus reducing the overall length of the entire device as compared with coupling devices without the guide pipe.

The operation of the device is as follows:

When the two members 1 and 2 are inserted into one another, the insert extension 5 strikes with its bevelled surface 9 against the clamping bosses 14 which thus spread outwardly, as shown in FIG. 2. Finally, the bevelled surface 9 passes beyond the sealing ring 7. The spread clamping fingers 13 then reach the front edge 27 of the sleeve jacket 26 which is thus forced to slide back together with the retaining sleeve 18, against the action of the compression spring 19, so that the clamping bosses 14 can enter the peripheral groove 10, whereupon the retaining sleeve 18 is forced by the spring 19 to move forwards into a position wherein the sleeve jacket surrounds the arrested clamping fingers 13 thus securing same in the coupled position. This locked state cannot be released even by a comparatively strong pull effected on the coupling members.

When disengaging the two coupling members, the retaining sleeve 18 is gripped with one hand, preferably over a knurled surface 28, and pushed back against the force of the spring 19, until the coverage of the clamping fingers 18 is removed. Subsequent pull on both or one of the coupling members results in the clamping bosses 14 escaping from the circumferential groove and the two coupling members can thus be separated from one another.

The coupling portions are preferably produced from a suitable plastic material. In such embodiment, both the male and the female member can be each produced as a single-piece unit without considerable difficulties, which provides for numerous advantages. The female member has only to be provided with the O-ring 7. The retaining sleeve 18, which can also be produced as a single-piece unit, is then pushed from the front end over the insert extension 5 following an appropriate positioning of the spring 19. The inside collar 21 is preferably formed in such a way that it yields upon the above loading and then returns back into its unreleasable position, whereby it defines the hollow in which the spring 19 is located.

The coupling device with a pipe guide according to the present invention can also be applied in the art of shaft couplings or plug couplings for rotating parts. In such a case, the peripheral groove is preferably produced in an interrupted fashion to provide segments each of which extends only over a small portions of the periphery, the length of the groove portions being adapted to correspond to the width of the clamping bosses, so that the clamping bosses are stopped in both directions of rotation thus providing for a connection wherein the two coupling members are prevented from turning of one with respect to the other.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1815660 *Apr 5, 1930Jul 21, 1931Walker Thomas MSlip socket tool joint
US2727759 *Oct 27, 1951Dec 20, 1955Hughes Tool CoValved couplers for fluid-conducting conduits
US2877437 *Oct 19, 1955Mar 10, 1959United Carr Fastener CorpConnector
US3476412 *Mar 5, 1968Nov 4, 1969Amp IncTubular connection device
US3709528 *Apr 16, 1971Jan 9, 1973Foster Mfg Co IncHose coupling
US3768476 *Jan 27, 1972Oct 30, 1973Concord Labor IncUrinary irrigation and drainage system
FR1455850A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4169793 *Jul 11, 1977Oct 2, 1979Tolo, IncorporatedTank drain assembly for swimming pool filters
US4190479 *Oct 24, 1978Feb 26, 1980Union Carbide CorporationMethod of producing a joint capable of transmitting high torque
US4202771 *Dec 29, 1978May 13, 1980Hoff Robert WChemical recovery filter
US4275907 *May 16, 1978Jun 30, 1981Huntal Manufacturing Company IncorporatedQuick connectable coupling
US4293149 *Sep 27, 1979Oct 6, 1981Industrias Neoplast, S.A.Rapid coupling for plastic pipes
US4352584 *Sep 12, 1979Oct 5, 1982Union Carbide CorporationMethod of producing a joint capable of transmitting high torque
US4448564 *Apr 13, 1983May 15, 1984Easco CorporationRetaining means for impact drive socket
US4451069 *Aug 9, 1982May 29, 1984Smith Investment CompanyQuick connect fluid coupling
US4548455 *Oct 15, 1984Oct 22, 1985Hosiden Electronics Co., Ltd.Connector with lock mechanism
US4599042 *May 18, 1984Jul 8, 1986Coolair Corporation Pte., Ltd.Fan casing volute
US4630847 *Oct 5, 1984Dec 23, 1986Colder Products CompanyMultiple tube connector
US4667062 *Sep 4, 1985May 19, 1987Cooper IndustriesSwivel fitting for electrical conduit and the like
US4673200 *Dec 17, 1985Jun 16, 1987Ikeda Bussan Co., Ltd.Fluid joint
US4714278 *Apr 15, 1986Dec 22, 1987Robert Bosch GmbhPlastic part provided with a metal threaded element
US4858964 *Mar 22, 1988Aug 22, 1989Usui Kokusai Sangyo Kaisha Ltd.T-joint for connecting branch pipe
US4872869 *Jun 24, 1988Oct 10, 1989Smith & Nephew (Latin America), Inc.Low profile ostomy device
US4875711 *Apr 25, 1988Oct 24, 1989Usui Kokusai Sangyo Kaisha Ltd.Slender tube connector
US4917407 *Sep 16, 1987Apr 17, 1990Heiner GassmannPlastic part provided with a metal threaded element
US4927374 *Apr 10, 1989May 22, 1990Amp IncorporatedModular electrical connector assembly
US4948014 *Oct 26, 1988Aug 14, 1990Rapak, Inc.Two piece valved fluid dispenser
US4948180 *Aug 22, 1989Aug 14, 1990Usui Kokusai Sangyo Kaisha Ltd.Connector for tube of small diameter
US4997216 *Sep 18, 1989Mar 5, 1991Usui Kokusai Sangyo Sangyo Kaisha, Ltd.Connector for connecting small diameter pipe
US5048875 *Jan 12, 1990Sep 17, 1991Usui Kokusai Sangyo Daisha LimitedConnector interposed between small-diameter metallic pipe and flexible hose
US5090748 *Aug 1, 1990Feb 25, 1992Usui Kokusai Sangyo Kaisha Ltd.Small-size piping coupling joint
US5094481 *Jul 6, 1990Mar 10, 1992Usui Kokusai Sangyo Kaisha LimitedConnector for small-diameter piping
US5098136 *Sep 26, 1990Mar 24, 1992Usui Kokkusai Sangyo Kaisha LimitedSmall-diameter pipe connector
US5100182 *Sep 20, 1990Mar 31, 1992U.S. Plastics CorporationFluid connector
US5112084 *Feb 5, 1990May 12, 1992Usui Kokusai Sangyo Kaisha, Ltd.Connector for small-diameter piping
US5114250 *Mar 18, 1991May 19, 1992Usui Kokusai Sangyo Kaisha Ltd.Joint for coupling small-diameter pipes
US5127682 *May 24, 1991Jul 7, 1992Usui Kokusai Sangyo Kaisha, Ltd.Joint
US5131691 *Aug 21, 1990Jul 21, 1992Usui Kokusai Sangyo Kaisha Ltd.Snap-fit connector for connecting slender piping members at end portions
US5141264 *Mar 18, 1991Aug 25, 1992Usui Kokusai Sangyo Kaisha Ltd.Connector for connecting thin tube
US5154451 *Jan 11, 1991Oct 13, 1992Usui Kokusai Sangyo Kaisha LimitedConnector for connecting thin pipe with blocks formed on claw walls
US5160177 *Jan 4, 1991Nov 3, 1992Usui Kokusai Sangyo Kaisha LimitedConnector for connecting slender piping members with cantilever mechanism
US5163719 *Jan 3, 1991Nov 17, 1992Usui Kokusai Sangyo Kaisha LimitedConnector for connecting slender piping members
US5172940 *Nov 20, 1989Dec 22, 1992Usui Kokusai Sangyo Kaisha, Ltd.Connector device for connecting small diameter pipe
US5176412 *Mar 18, 1991Jan 5, 1993Usui Kokusai Sangyo Kaisha, Ltd.Joint for coupling small-diameter pipes
US5211427 *Dec 20, 1991May 18, 1993Usui Kokusai Sangyo Kaisha Ltd.Piping connector
US5240289 *May 8, 1992Aug 31, 1993Mannesmann AktiengesellschaftPlug-type connection for a tubular body
US5284369 *Aug 16, 1991Feb 8, 1994Tokai Rubber Industries, Ltd.Quick connector
US5328216 *Mar 10, 1993Jul 12, 1994Usui Kokusai Sangyo Kaisha Ltd.Thin pipe connecting joint
US5343892 *Jul 10, 1993Sep 6, 1994Nitto Kohki Co., Ltd.Pipe coupling
US5354106 *May 27, 1992Oct 11, 1994Usui Kokusai Sangyo Kaisha Ltd.Connector for connecting a pipe of small diameter with block expansion prevention surfaces
US5413387 *Jan 26, 1993May 9, 1995Proprietary Technology, Inc.Swivelable quick connector assembly
US5882047 *Dec 20, 1996Mar 16, 1999Itt Automotive, Inc.Quick connector fluid coupling
US5964484 *Mar 1, 1999Oct 12, 1999Proprietary Technology, Inc.Swivelable quick connector assembly
US5992903 *Jan 30, 1998Nov 30, 1999Proprietary Technology, Inc.Swivelable quick connector assembly
US6089620 *Jun 27, 1997Jul 18, 2000Fico Transpar, S.A.Rapid connection and disconnection device for electropumps and conduits for motor vehicle wind-shield washing systems
US6743358 *Aug 16, 2000Jun 1, 2004Surfcleaner AbApparatus for collecting material floating on a body of water
US6971684 *Jun 13, 2003Dec 6, 2005Ferrari Group SrlFast coupling for irrigation systems, particularly domestic irrigation systems
US7066496Aug 15, 2003Jun 27, 2006Swagelok CompanyFitting with separable gripping device for pipe and tube
US7108288Feb 6, 2002Sep 19, 2006Swagelok CompanyTube fitting with separable tube gripping ring
US7284772Dec 14, 2004Oct 23, 2007Alder Randall FCoupling assembly
US7393018Feb 6, 2002Jul 1, 2008Swagelok CompanyTube fitting for stainless steel tubing
US7407196Sep 14, 2006Aug 5, 2008Swagelok CompanyTube fitting with separable tube gripping device
US7416225Aug 15, 2003Aug 26, 2008Swagelok CompanyFitting for metal pipe and tubing
US7441664Sep 18, 2003Oct 28, 2008Pur Water Purification Products Inc.Water treatment devices and cartridges therefor
US7611503Apr 16, 2004Nov 3, 2009Medrad, Inc.Fluid delivery system, fluid path set, sterile connector and improved drip chamber and pressure isolation mechanism
US7677602Oct 30, 2007Mar 16, 2010Swagelok CompanyTube fitting
US7695027Apr 22, 2005Apr 13, 2010Swagelok CompanyFitting for tube and pipe
US7726699 *Feb 1, 2005Jun 1, 2010Okey Holding BvDental treatment apparatus
US7740283Oct 30, 2007Jun 22, 2010Swagelok CompanyTube fitting with separable tube gripping device
US7762592Jun 13, 2008Jul 27, 2010Swagelok CompanyTube fitting for stainless steel tubing
US7784837Nov 2, 2004Aug 31, 2010Swagelok CompanyFitting for metal pipe and tubing
US7806915Apr 27, 2006Oct 5, 2010Zoll Circulation, Inc.Apparatus and method for providing enhanced heat transfer from a body
US7815226Aug 25, 2008Oct 19, 2010Swagelok CompanyFitting for metal pipe and tubing
US8038180Feb 23, 2009Oct 18, 2011Swagelok CompanyFitting with taper and single ferrule
US8215492Sep 12, 2008Jul 10, 2012Pur Water Purification Products, Inc.Water treatment devices and cartridges therefor
US8540698Dec 3, 2004Sep 24, 2013Medrad, Inc.Fluid delivery system including a fluid path set and a check valve connector
US20110198841 *Aug 11, 2008Aug 18, 2011Hiroyuki KitagawaPipe coupling apparatus
USRE32864 *Oct 6, 1987Feb 14, 1989Hosiden Electronics Co. Ltd.Connector with lock mechanism
EP0140995A2 *Dec 19, 1983May 15, 1985Pietro RossiAutomatic snap-joint for piping
WO2006116603A2 *Apr 27, 2006Nov 2, 2006Radiant Medical IncApparatus and method for providing enhanced heat transfer from a body
WO2014000917A1 *Apr 29, 2013Jan 3, 2014Robert Bosch GmbhPlug-in connector, in particular for media-conducting lines
Classifications
U.S. Classification285/24, 285/319, 285/316, 285/331
International ClassificationF16L37/098
Cooperative ClassificationF16L37/0982, F16L37/0985
European ClassificationF16L37/098B